Root porosity, radial oxygen loss and iron plaque on roots of wetland plants in relation to zinc tolerance and accumulation
Root porosity, radial oxygen loss and iron plaque on roots of wetland plants in relation to zinc tolerance and accumulation
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DOI：
10.1007/s11104-013-1922-7
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发表时间：
2013
期刊：
影响因子：
4.9
通讯作者：
Junxing Yang;N. Tam;Z. Ye
中科院分区：
文献类型：
--
作者：
Junxing Yang;N. Tam;Z. Ye
背景和目标湿地植物已广泛应用于人工湿地中，以净化金属污染的水体。本研究探讨了湿地植物的径向氧损失率（ROL）、根系孔隙率、锌吸收率和耐受性、铁斑形成等之间的关系。方法通过水培试验和锌污染土壤盆栽试验，对不同的挺水湿地植物进行不同锌水平的处理。结果水培实验中植物的根系孔隙率、ROL率、锌吸收率和耐锌指数以及铁锰浓度存在显着差异。在盆栽试验中，在根部和根际。根孔隙度、ROL 率、耐锌性、根部和根际的 Zn、Fe 和 Mn 浓度之间存在显着的正相关。根孔隙度和ROL较高的湿地植物往往有更多的铁斑，根部和根际的锌浓度较高，并且对锌毒性的耐受性更强。结论我们的研究结果表明，ROL和根孔隙度在铁斑形成、锌吸收和耐受性中发挥着非常重要的作用，并且是选择用于锌污染水体和土壤/沉积物植物修复的湿地植物的有用标准。
Background and aimsWetland plants have been widely used in constructed wetlands for the clean-up of metal-contaminated waters. This study investigated the relationship between rate of radial oxygen loss (ROL), root porosity, Zn uptake and tolerance, Fe plaque formation in wetland plants.MethodsA hydroponic experiment and a pot trial with Zn-contaminated soil were conducted to apply different Zn level treatments to various emergent wetland plants.ResultsSignificant differences were found between plants in their root porosities, rates of ROL, Zn uptake and Zn tolerance indices in the hydroponic experiment, and concentrations of Fe and Mn on roots and in the rhizosphere in the pot trial. There were significant positive correlations between root porosities, ROL rates, Zn tolerance, Zn, Fe and Mn concentrations on roots and in the rhizosphere. Wetland plants with higher root porosities and ROL tended to have more Fe plaque, higher Zn concentrations on roots and in their rhizospheres, and were more tolerant of Zn toxicity.ConclusionsOur results suggest that ROL and root porosity play very important roles in Fe plaque formation, Zn uptake and tolerance, and are useful criteria for selecting wetland plants for the phytoremediation of Zn-contaminated waters and soils/sediments.